#include <stdio.h>
/* 函数声明 */
double getAverage(int arr[], int size);
int main ()
{
	int balance[5] = {1000, 2, 3, 17, 50};
	double avg;
	/* 传递一个指向数组的指针作为参数 */
	avg = getAverage( balance, 5 ) ;
	printf( "平均值是： %f ", avg );
	return 0;
}

double getAverage(int arr[], int size)
{
	double avg, sum = 0;
	for ( int i = 0; i < size; ++i)
	{
		sum += arr[i];
	}
	avg = sum / size;
	return avg;
}

